Improvement in school-slate frames



UNITED STATES PATENT OFFICE,

WILLIAM SELLERS, OF NEW YORK, N.

`IMPROVEMENT IN SCHOOL-SLATE FRAMES.

Specification forming part of Letters Patent No. 173,423, dated February15, 1876; application filed September 22, 1875.

Tooll whom it may concern:

Be it known that I, WILLTAM SELLERS, of the city of New York, county andState of New York, have invented an Improved Slate- Pencil Sharpener, ofwhich the following is a specification rDhis invention relates to animproved combined school-slate and slate-pencil Sharpener; and consistsin cutting into the edge of the slate-frame from one end thereof to theother,

and through the tenons that join the different parts ofthe slate-frameat the corners, a straight continuous groove having a V-shapedcrosssection, and in lining the sides of such groove with enlery Aorequivalent'abrading substance, all as hereinafter more fully described.

In the drawing, Figure l is a face or plan view of a school-slateprovided with my iin! proved sharpener. Fig. 2 is an end edge View ofthe same.

Similar letters of reference indicate corresponding parts in all thegures.

The letters A A represent the four strips or pieces of wood thatconstitute :the frame of a school-slate. The side pieces A are united tothe end pieces by projecting tenons formed at the ends ot' the latterand litted into slots formed at lthe ends of the side pieces in thecustomary manner. The entire slate-frame is, on the outer edge of one ofthe side pieces, grooved along its entire length, said groove extendingfrom end to end of the ysaid piece, and along and into the ends of thetenons that join the side strip to the endstrips, respectively. .Thisgroove wis of V-shaped or similar form in cross-section, as clearlyshown in Fig. 2, and is covered with santi, emery, or other suitableabrading substance, which is fastened thereto by glue or other suitableadhesive material.

The pencil to be sharpened has its end inserted in the groove a., and isthen drawn along the entire groove from end to end, care being taken toturn the pencil, so that all its sides are subjected to the action ofthe grindingsurface.

I am aware that the patent, No. 61,253, of J. Rheershows a slateprovided with av groove on the frame; but such groove does not eX- tendfrom end to end of the frame, nor does it en ter into. the ends of thetenons of the crosspieces. I ain also aware of' the Patent No. 136,230,granted to W. H. Flanigan, February 25, 1873, Which shows a ruler madefrom one piece of Wood and provided with a V-shaped groove forsharpening purposes, all of which I do not claim; nor do I claimattaching metallic Sharpeners to slate-frames, which has heretofore beendone; but

I do claim- Aschool-slate frame grooved and roughened at one edge or oneside, as described, to constitute a pencil-Sharpener, When said grooveextends along the entire edge A from end to end thereof, and into thetenons that enter at said edge, substantially as and for the purposespecified.

WILLIAM SELLERS.

Witnesses:

ERNEST C. WEBB, F. V. BEIEsEN.v

